Basic Electrical Engineering (BEE) SPPU Endsem Question Paper May 2025

Questions

1. Q1

   1. a)

      For the Resonance in RLC Series circuit-Comment on reactance’s, impedance, current & power factor.

      [4]
   2. b)

      The R-L circuit when supplied by 180V, 50 Hz ac voltage, the voltage drop across the inductance is 150 V. The current drawn by the circuit is 5 A. Calculate: i) Inductive Reactance ii) Inductance iii) Resistance iv) Impedance v) Voltage across Resistance and vi) P.F.

      [6]
   3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]
   OR

2. Q2

   1. a)

      Define and state the unit of i) Admittance, susceptance,& conductance ii) Impedance

      [4]
   2. b)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]
   3. c)

      A Pure resistance of 15  is connected in series with a pure inductor of 25mH. This series circuit is connected across 230V, 50-Hz supply. Find i) The Inductive Reactance ii) Impedance iii) Current iv) Power factor v) Phase angle vi) Voltage across Resistor vii) Voltage across inductor viii) Draw the phasor diagram

      [8]

3. Q3

   1. a)

      State the advantages of three phase systems over single phase system.

      [3]
   2. b)

      Derive the EMF Equation of single-phase transformer.

      Also asked:Jan 2026 ·Nov 2025 ·May 2024 ·Nov 2023 ·May 2023

      [6]
   3. c)

      In a 3-phase Star-connected load, each phase has a an impedance of (50+j32)  . This load is fed from three phase supply voltage of 400 V with frequency of 50Hz. Calculate: i) Phase Voltage and Line Voltage; ii) Phase Current and Line Current; iii) Total Active Power, Reactive Power and Apparent Power consumed. 3

      [8]
   OR

4. Q4

   1. a)

      State the different types of losses in the transformer.

      [3]
   2. b)

      A 80 KVA, 3200/400V, 50Hz, single phase transformer has 111 turns on the secondary winding. Calculate i) Number of turns on primary side ii) Primary & Secondary full load current iii) Cross sectional area of the core if the maximum flux density is 1.2T

      [6]
   3. c)

      Derive the relationship between the line current and phase current, line voltage and phase voltage, for a balanced three phase STAR connected load across three phase AC supply. Draw the circuit diagram & required phasor diagram. Assume phase sequence RYB and inductive load.

      Also asked:May 2024 ·May 2023

      [8]

5. Q5

   1. a)

      Compare the ideal & practical voltage source by means of i) definition ii) Symbol & V-I characteristics.

      [4]
   2. b)

      Write the three steps to find current flowing through load resistance R L using Thevenins Theorem for the circuit shown in Figure-5 (b).

      [6]
   3. c)

      Derive the formulae to convert DELTA connected resistances into equivalent STAR connected resistances. Draw the circuit diagram in each case.

      [8]
   OR

6. Q6

   1. a)

      State and Explain Kirchhoffs Laws.

      [4]
   2. b)

      Find the Resistance between terminal A and C. 4

      Also asked:Jan 2026

      [6]
   3. c)

      Find the current flowing through 5  by applying Super Position Theorem.

      Also asked:Dec 2025

      [8]

7. Q7

   1. a)

      Comment on effect of increase in temperature on Resistance of i) metallic conductor ii) alloys & iii) insulators

      [3]
   2. b)

      Explain the construction and working of Lead acid battery.

      Also asked:Nov 2025 ·Nov 2023

      [6]
   3. c)

      Derive the expression of insulation resistance of the single core cable. Draw the cut section diagram & label it.

      Also asked:May 2024 ·Nov 2023 ·May 2023

      [8]
   OR

8. Q8

   1. a)

      State the 3 applications of lithium ion battery.

      [3]
   2. b)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]
   3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]